Fill in the blanks.
The ratio of adults to children is 7 : 4.
The ratio of girls to boys is 1 : 9.
Use LCM and find the following.
- Number of adults = _____ u
- Number of girls = _____ u
- Difference in the number of boys and girls = _____ u
- Total number of people = _____ u
Adults |
Children |
7x5 = 35 u |
4x5 = 20 u |
|
Girls |
Boys |
10 |
1x2 |
9x2 |
35 u |
2 u |
18 u |
(a)
Change ratio into units.
Girls : Boys : Children
1 : 9 : 1 + 9
1 : 9 : 10
The number of children is the repeated identity.
LCM of 4 and 10 is 20.
Number of adults = 35 u
(b)
Number of girls = 2 u
(c)
Difference in the number of boys and girls
= 18 u - 2 u
= 16 u
(d)
Total number of people
= 35 u + 20 u
= 55 u
Answer(s): (a) 35; (b) 2; (c) 16; (d) 55